Jar mill



P. o. ABBE.

JAR MILL Nov. 5, 1935.

Filed Sept. 19, 1935 other hard material which will endure consid- Patented Nov. 5, 1935 UNITED. STATES PATENT OFFICE 5 Claims.

This invention relates to jars and covers and means for securing the covers upon the jars, when the latter are used in rotary mills of the type called jar mills.

The main object of my a jar mill with a jar of improved form, both as to capacity and ease of insertion and release from the mill.

Another object is to provide a mill with such a jar which embodies a design of very great strength, and which has an efficient and extremely simple means for ensuring a positive closure for the cover upon the jar.

It is also an object of the invention to provide a jar of the character indicated which may be used in existing jar mills and which may be made in various sizes as well as of any material which is ordinarily considered useful for the jars or drums forming the main element in a ball and pebble mill, particularly of the jar mill type.

Other objects and the several advantages inherent in the construction and principles of my invention will appear more fully in detail hereinafter as this specification proceeds.

In the accompanying drawing forming part hereof,

Fig. 1 is a perspective View of a ball and pebble mill of the jar mill type which is equipped with a jar and cover with fastening means made according to my invention and embodying the salient features thereof in a practical form.

Fig. 2 is a central vertical section of the jar with its cover, intermediate gasket and the fastening means, when the jar is in upright position, as taken on line 22 of Fig. 4.

Fig. 3 is a similar view, wherein the fastening means are omitted.

Fig. 4 is an entire view of the jar and its cover and the fastening means or closing device for the 7 cover.

Throughout the views, the same reference numerals indicate the same or like parts.

In ball and pebble mills it is usual to have the interior of the drums forming the main rotative elements thereof lined with porcelain or some erable abrasion, but when the mill involved is of a smaller type, such as a jar mill, a jar replaces the drum and is made of porcelain or other vitreous material and is also preferably removable from the rest of the machine and opened at one end. Of course, when removed from the mill, the jar member is stood upright upon one end so that the other end becomes the top, and it is this upper end or top which is thus opened.

l invention is to provide In common with all ball and pebble mills, the jar mill is rotatable and may contain balls of metal or porcelain or else pebbles which are mixed with the material within intended to be crushed or pulverized. On the other hand, the 5 machine must in this case have a cradle or the like for receiving the jar which forms the container, and also means for securing the jar in said cradle during rotation.

Now, in the practise of my invention, a jar mili, 10 generally indicated at l is of conventional construction, comprising the base 3, the standards 4,

t, surmounted by bearings 5, 5 in which rest trunnions similar to 6 of a jar frame or cradle l. Upon one trunnion is mounted the pulley 8 which 15 may receive a drive from a motor or from a power shaft, but it could of course be replaced by a gear orthe like.

However, the jar cradle I has a carrying strap beneath the jar at 9, and a securing strap 10 20 which latter may be released from the anchorage H on the frame 1 by unscrewing the wing nut l2 a limited distance on screw l3 which forms the end of the securing strap. The jar it may therefore in this form of mill be secured in the 25 cradle by means of the mentioned straps, but it is to be noted that instead of the cradle or frame 1, some other structure known in the art may be used, such as a metal shell, for example.

On the other hand, two or more jaws may be 30 secured in the same cradle or shell, if desired, such structures also being known in the art, and are then made of the proper size and form to accommodate the intended number of jars.-

Nevertheless, the most important feature here- 35 in is the jar and its cover, and it is also part of the idea as a'whole to include a gasket and a closing device for the cover, which in the present invention is essential to the success as well as the simplicity of operation possible with the 4 same. This is readily seen when it is consid-x ered that in known jars for this type of mill, the cover has usually been fitted as a plug into the mouth of the jar, seriously straining the same and necessitating a bulky construction causing loss of interior space, while the present jar M has a relatively flat cover it: which lies upon the plane end or face 26 of the tapered neck IS. A gasket 25 of rubber, leather or any other suitable material is interposed between the cover and the face 26 and in an initial manner forms a closure for the jar.

While the marginal portion of the cover is practically plane upon both sides, the underside within the plane portion 21 is made convex as indicated at 28 toserve as an interior reinforcement so that it will be possible for the cover to receive a considerable pressure from the exterior to hold it in closed position upon the jar. Exteriorly, the cover has a reinforcing portion I6 for the same purpose, whose utility will immediately appear.

The neck portion IQ of the jar is exteriorly tapered or flared outward, and upon this neck is mounted an anchoring band I8 which has a pair of opposite lugs 20, 20. Each of the lugs has an aperture 22 therein adapted to receive one end of a locking bar I! through which a manually operated screw 23 may be screwed. Manifestly, if the band I8 is in position adjacent the lowest or narrowest point 24 of the flared neck l9, and the bar I! brought into position over the cover with both ends in the apertures of the lugs on band I8, then if the cover is in proper position upon the jar, with a gasket interposed between the cover and the jar, it will easily be possible to screw down the screw 23 so as to engage against part N of the cover. When the screw is brought down by screwing to press very heavily upon the cover, the band l8 will tend to rise a little until it binds very tightly upon neck l9, and then the bar I1 will be held in the upper portions of the apertures in both lugs on the locking band l8, with the result that the parts in engagement have no play whatever, but hold down the cover upon the upper edge or face 26 of the jar with very great force. This makes a gas tight joint which, however, does not strain the jar, due to the slight taper of the flaring neck IQ, for the pressure from the cover is practically exerted down in line with the direction of greatest strength of the wall of said jar, and there is practically no expansive strain on the neck. The band about the neck materially reinforces the same against any possibility of expansion from within, so that substantially the only strain is end pressure on the jar from the top downward.

If the flared portion of the jar were made as abrupt as at an angle of 45, there would often be difliculty encountered in firing the 'jar, as cracks would tend to appear upon the neck and thus ruin the same, but now, as the neck is almost straight, no such imperfections occur. Moreover, the interior parts 29 and 30 of the mouth of the jar are but slightly constricted, because of the slight taper or flare of the neck, with the result that introduction and discharge of materials occurs very easily without the slightest impediment. to such operation, and the interior is so readily accessible from without as to make it easy to clean the jar at all times. The constrictedportion is thus very strong, serves a very useful purpose, and renders the jar very easy to manufacture and use, for the jar is practically straight sided and the constricted portion terminates in a very slightly flaring mouth which has a flat top edge. The latter is easily finished off plane so as to be adapted to receive a gasket thereon, and there is a complete absence of cutout portions or Weak points such as found in jars known heretofore. There is also an exceedingly efficient use of the space in the upper portion of the jar, for the cover does not extend into the jar but lies upon the top thereof, while there is no necessity for excessive dimensions of any parts nor for having any sharp angles or shoulders in the structure of the jar which, as heretofore have often wasted space and obstructed operation when removing material from the jar or attempting to clean the same.

Naturally, the form of mill in which the jar is used is of secondary importance, for it may be a grinding mill, a ball and pebble mill, or as 5 particularly described herein, a jar mill. It is also obvious that variations may be resorted to and parts used without others, within the scope of my invention. Furthermore, the size of apparatus in which the invention is used is also not an essential feature, nor of what material the jar is made, or what metal or other suitable material enters into the composition of the crossbar H, the band l8 or its lugs, or the screw 23, for this is usually iron or steel, or may be a. brass composition, as desired.

Having now fully described my invention, I claim:

1. A jar and closure therefor, adapted for use in a jar mill, comprising in combination, a jar having a main hollow body portion surmounted by a conically flaring flange serving as an open mouth portion, there being a cover fitting removably upon said flange and a cross bar overlying said cover when in closed position, a metal band enveloping a part of the exterior conical portion of said conically flaring flange and. having a pair of lugs projecting rigidly from said band and extending past said cover and formed with individual apertures through which the ends of said cross bar extend for the purpose of retaining the latter in position over said cover, and adjustable means for drawing up said metal band snugly upon the exterior conical surface of said flange toward the edge of the flange and thereby tightening down the cover upon the top of said flange.

2. A jar and closure therefor according to claim 1, wherein the flange has a flat top and a gasket is interposed between the same and the 40 cover, and wherein the adjustable means for tightening down said cover on said top includes a screw member extending through the cross bar and bearing upon the top of said cover.

3. A jarand closure therefor according to claim 1, wherein the metal band enveloping the flange is'approximately conical in form to correspond with the exterior shape of the conically flaring flange and allow the same to. be drawn up snugly upon said flange toward the edge or top thereof.

4. A jar and closure therefor according to claim 1, wherein the conically flaring flange connects with the main hollow body portion of the jar by means of a reduced portion and the metal 5 or top thereof.

5. A jar and closure therefor according to claim 1, wherein the metal band enveloping the flange is approximately conical in form to correspond with the exterior shape of the conically flaring flange and allow the same to be drawn 5 up snugly upon said flange toward the edge or top thereof, and the adjustable means for tightening down the cover uponthe top of said flange includes a screw member extending through the cross bar and bearing upon said cover, and also wherein the cover has a reinforced portion upon the exterior thereof to receive the strain imposed upon the cover by said screw member.

PAUL o. ABBE'I. 

